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Print in friendly format Send this term to a friend  Regular Production Order
Commonly known as RPO. These are the codes that GM uses to identify options.

For example, LT1 is the RPO for the engine used from 1992-1996.

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Re: Just had my ECM rebuilt, Speedo/MPG is glitched

Subject: Re: Just had my ECM rebuilt, Speedo/MPG is glitched
by Matatk on 2008/9/3 2:02:39

There is a vehicle speed sensor (VSS) on the trans that sends data for the speedometer. Sometimes the plastic gears go bad or could be an electrical connection problem. I'm not exactly sure where it's at, but I believe Bogus is familiar with this and should chime in.

Matthew
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